Sink



FIG. 1 is a top plan view of a sink embodying my design

FIG. 2 is a left, front top perspective view thereof

FIG. 3 is a right, front top perspective view thereof;

FIG. 4 is an bottom plan view thereof;

FIG. 5 is a left side elevation view thereof; and,

FIG. 6 is a front elevation view thereof.

Plumbing holes shown are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a sink, as shown and described. 